JPH0312830Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement of a device for preventing sewage, rainwater, etc. from entering a manhole.

Prior Art Various structures have been proposed for manhole water intrusion prevention devices. To give some examples, a structure in which an annular drainage groove is provided around the upper surface of the manhole frame to guide sewage, etc. that is about to flow into the manhole into the annular drainage groove, and a structure in which an annular gasket is installed on the periphery of the lower surface of the lid body. A structure that prevents water intrusion by surrounding the structure, and a structure that combines the former and the latter were proposed in public gazettes around 1981.

Problems to be solved by the invention When using the annular drain structure of the prior art described above,
If the amount of water that tries to flow into the manhole suddenly increases, there is a risk of overflowing from the annular drainage ditch and flooding.
When using an annular packing structure, there were problems with the means for attaching the packing to the lid, the mounting position of the packing to ensure close contact with the manhole frame, etc., and it was difficult to call it an effective water intrusion prevention device. Even with the combination structure of the above two, the above problem has not been solved.

Means for Solving Problems The present invention was made in view of the above-mentioned conventional technology, and utilizes a manhole frame, a cover body, and a link, and strongly pinches the gasket on the top surface of the manhole frame between the cover body and the link. It is configured so that it can be attached.

Action: By moving the vertically movable part of the lid downward, one end of the link is lowered, and at the same time, the engaging portion at the other end of the link is rotated upward, and the engaging portion is engaged with the manhole frame. The gasket on the top surface is strongly sandwiched between the lid and the link, thereby preventing sewage, etc. from entering the manhole. Then, by moving the vertically movable part upward and raising one end of the link, at the same time rotating and lowering the engaging part at the other end of the link, the engagement between the manhole frame and the engaging part is released.
The seal is released from the strongly pinched state, and at the same time, the lid body can be removed from the manhole frame and the manhole can be opened.

Embodiment To explain an embodiment of the present invention with reference to the drawings, a manhole frame 1 is formed in an annular shape, and an annular packing 2 is disposed around the upper surface, and the inner peripheral surface has a substantially doglegged cross section in the centripetal direction. A protruding engaging portion 101 is configured, and the engaging portion 501 of the link 5 is disengaged from this engaging portion. The gasket 2 is formed into a hollow or solid body made of a water-impermeable elastic material, and is fitted into an annular fitting groove 102 provided around the upper surface of the manhole frame 1 so as not to easily come off. The lid body 3 is
A vertically movable part 4 is formed in the center, bearing pieces 301 are vertically disposed at a plurality of peripheral parts of the lower surface, and the other end of the link 5 is rotatably attached to the bearing pieces by a short shaft 502. One end can be moved up and down. The vertically movable part 4 has a flange 402 formed at the lower end of a vertically movable movable rod 401 that penetrates through the center of the lid 3, and a bearing piece 3 on the upper surface of the flange.
The same number of support pieces 403 as 01 are set up, and the support pieces 403 are arranged opposite to the bearing piece 301.
One end of the link 5 is rotatably and laterally movably supported by a short movable shaft 405 to a supporting portion 404 such as a long groove or a long hole installed horizontally in 3, and an ammunition 406 is wound around the movable rod 401. At least flange 4
02 is always pressed downward, a puller 407 is attached to the upper end of the movable rod 401 so that it can be raised and lowered, and when the puller is pulled up, the movable rod 401 and the flange 402
moves upward against the force of the projectile 406, and at the same time one end of the link 5 rises. Movable rod 401 and flange 402 in the vertically movable part 4
The related structure is not limited to the illustrated structure in which the peripheral wall surrounding the center of the flange and the movable rod 401 are connected with pins, but it is also possible to fix the flange 402 to the lower end of the movable rod. It is. The link 5 has one end rotatably and laterally movably attached to the vertically movable part 4, the upper side of the other end rotatably attached to the lower peripheral edge of the lid body 3, and the lower side of the other end rotatably attached to the lower side of the lid body 3. The engaging portion 501 is configured to protrude in a substantially dogleg shape in the axial direction, and the upper inclined portion of the engaging portion is configured to be able to be engaged with and disengaged from the lower inclined surface of the doglegged engaging portion 101 of the manhole frame 1. When the vertically movable part 4 is in the lowered position as shown in the second diagram, the flange 402 of the link 5 is pressed downward by the elastic force of the bullet 406, so that one end of the link 5 is lower than the other end. At the lower position, the engaging portion 501 of the other end engages with the engaging portion 101 of the manhole frame 1, the peripheral edge of the lid 3 is brought into close contact with the gasket 2 so as to be pulled downward, and the lid 3 is brought into contact with the link 5. In cooperation with the manhole, the gasket 2 is tightly clamped to prevent water from entering and protect the instruments installed at the bottom of the manhole. And link 5 is the third
When the vertical movable part 4 is pulled up as shown in the figure, the flange 402 compresses the bomb 406 while resisting the spring force and moves upward, collaborating with the link 5 to strongly pinch the packing 2 and prevent water from entering. prevention and protect the instruments installed at the bottom of the manhole. Then, when the link 5 pulls up the vertical movable part 4 as shown in the third diagram,
The flange 402 compresses and moves upward while resisting the elastic force, causing one end of the link 5 to rise while rotating and moving laterally along the support portion 404, and by this rise, the link 5 The other end rotates around the short shaft 502, and rotates the engaging portion 501 that was engaged with the engaging portion 101 of the manhole frame 1 downward to release the engagement, as shown in FIG. The cover body 3 can now be removed from the manhole frame 1 as shown in FIG.

Effects of the invention Since the present invention has the above-mentioned configuration, the vertical movable part is moved down to the lowered position, one end of the link is lowered, and at the same time, the engaging part of the other end is rotated and raised. When engaged, the lid will come into close contact with the gasket on the top of the manhole frame, and the lid and link will strongly pinch the gasket, preventing sewage, rainwater, etc. from entering the manhole. Protect instruments installed inside. Then, by moving the vertically movable part upward and simultaneously raising one end of the link and simultaneously rotating and lowering the engaging part at the other end, the manhole frame and the link are disengaged, and the seal is held in place by a strong pinch. The manhole can be opened and instruments can be inspected, replaced, and repaired.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway cross-sectional plan view of the water intrusion prevention device of the present invention, Fig. 2 is a longitudinal sectional view taken along line 2-2 in Fig. 1, and Figs. 3 and 4 are disengagement operations of the lid body. FIG. 6 is a vertical cross-sectional view showing the procedure. In the figure, 1... Manhole frame, 2... Packing, 3... Lid body, 4... Vertically movable part, 5... Link, 501...
…Outside of the relationship.

Claims (1)

[Scope of utility model registration request] A packing is provided around the top of the manhole frame, a vertically movable part is provided on the lid, one end of the link is rotatably and laterally movably attached to the vertically movable part, and the other end of the link is attached to the lid. A manhole intrusion prevention device that is rotatably attached to the lower surface of the link and has an engaging part for the manhole frame at the other end of the link.